X+2x=12+6

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Solution for X+2x=12+6 equation: 



X+2X=12+6

We move all terms to the left:

X+2X-(12+6)=0

We add all the numbers together, and all the variables

X+2X-18=0

We add all the numbers together, and all the variables

3X-18=0

We move all terms containing X to the left, all other terms to the right

3X=18

X=18/3

X=6

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